A model-based controller for the cascade H-bridge multilevel converter used as a shunt active filter

This paper presents the modeling and control processes of the single-phase cascade H-bridge multilevel converter used as a shunt active filter. Based on the obtained model, a controller is proposed to compensate for harmonic distortion and reactive power caused by a nonlinear load. These issues are solved by guaranteeing tracking of the line current toward an appropriately defined current reference. In the proposed approach, the current reference has been selected to be a signal proportional to either the line voltage or to its fundamental component; however, the proposed method can also be extended to other reference definitions. The proposed controller also includes voltage loops to guarantee regulation and balance of the involved capacitor voltages toward constant references. Experimental results on a 2-kVA prototype are presented to assess the performance of the proposed controller. © 1982-2012 IEEE.

Active filters; Adaptive control; Multilevel systems; Reactive power control Reactive power; Adaptive Control; Capacitor voltages; Cascade h-bridge multilevel converters; Fundamental component; Model-based controller; Modeling and control; Multi-level systems; Shunt active filters; Active filters

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